Thunderous Burst

A thunderous rumble erupts from a point within range. Each creature in a 30-foot cube originating from you must make a Constitution saving throw.  On a failed save, a creature takes 3d12 thunder damage and is knocked prone. On a successful save, the creature takes half as much damage and isn't knocked prone.

In addition, unsecured objects that are completely within the area of effect are knocked over by the spell's effect, and the spell emits a thunderous rumble audible out to 300 feet.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d12 for each slot level above 3rd.